Exhibit 21.1

Subsidiaries of the Registrant

TeleCommunication Systems Corp. of Maryland, a Maryland corporation

TeleCommunication Systems (Holdings) Limited, a United Kingdom corporation

TeleCommunication Systems Limited, a United Kingdom corporation

TeleCommunication Systems (Maryland) AB, a Sweden corporation

TeleCommunication Systems Benelux BV, a Netherlands corporation

TeleCommunication Systems Iberian, SA, a Spain corporation

TeleCommunication Systems Technology Limited, a United Kingdom corporation

Aether Systems (UK) Limited, a United Kingdom corporation